P.038 SIMULTANEOUS DETERMINATION OF WAVE SPEED AND THE ARRIVAL TIME OF REFLECTED WAVES USING THE PRESSURE-VELOCITY LOOP

2007 ◽  
Vol 1 (S1) ◽  
pp. S36
Author(s):  
A.W. Khir* ◽  
M.J.P. Swalen ◽  
K.H. Parker
Keyword(s):  
Simultaneous Determination ◽  
Wave Speed ◽  
Arrival Time ◽  
Reflected Waves

Determination of Transient Responses of a Thick-Walled Spherical Shell by the Ray Theory

1978 ◽  
Vol 45 (1) ◽  
pp. 114-122 ◽  
Author(s):  
Yih-Hsing Pao ◽  
Ahmet N. Ceranoglu
Keyword(s):  
Spherical Shell ◽  
Arrival Time ◽  
Applied Pressure ◽  
Ray Theory ◽  
Multiple Reflections ◽  
Transient Responses ◽  
Reflected Waves ◽  
Ray Path ◽  
The Waves

The dynamic response of a thick-walled elastic spherical shell subject to radially symmetric loadings is studied by applying the theory of rays. The Fourier transformed solution of the waves in the shell is sorted out into rays by following the ray-path of the multiply reflected waves at both surfaces. Inverse transform of each ray, which is obtainable in closed form, gives rise to the exact solution of the transient response up to the arrival time of the next ray. Numerical results are shown for internally applied pressure with a step or a square-time function. The radial stresses are found to be critically large in tension due to multiple reflections at both surfaces of a thick shell.

A general computer program for the extended plate overlap algorithm

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide
Keyword(s):  
Computer Program ◽  
Simultaneous Determination ◽  
General Computer Program ◽  
General Computer

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.

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